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  4. Europium is :

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Q. Europium is :

MGIMS WardhaMGIMS Wardha 2006

Solution:

Europium (Eu) is a $ f- $ block element, it belongs to the 4f series and its electronic configuration is $ [Xe]\,4{{f}^{7}}\text{ }5{{d}^{0}}\,6{{s}^{2}} $ .